Ichigo Kurosaki (黒崎 一護, Kurosaki Ichigo) is a Human who has Shinigami powers and is a Substitute Shinigami. Ichigo is the son of Isshin and Masaki Kurosaki, and older brother of Karin and Yuzu. He is also married to Orihime Inoue and has a son named Kazui Kurosaki.
Rukia Kuchiki (朽木 ルキア, Kuchiki Rukia) is the current Captain of the 13th Division. She formerly served as lieutenant of the 13th Division under Captain Jūshirō Ukitake. Rukia is the adoptive sister of Byakuya Kuchiki and a friend of Ichigo Kurosaki.
Sōsuke Aizen (藍染 惣右介, Aizen Sōsuke) is the former captain of the 5th Division in the Gotei 13. He later leaves Soul Society with his followers, Gin Ichimaru and Kaname Tōsen. His lieutenant was Momo Hinamori. He formerly served as the lieutenant of the 5th Division under Shinji Hirako.
Uryū Ishida (Japanese: 石田 雨竜, Hepburn: Ishida Uryū, rendered as "Uryū" in the Viz Media manga and "Uryu" in the Viz Media anime and Bleach: The 3rd Phantom) is a fictional character and major figure in the anime and manga series Bleach created by Tite Kubo.